Types of intercoms: how to choose the best option. Types of video intercoms. How to choose? Modern intercom: types

Now the intercom is a common device: they are installed in private homes, in apartment buildings, in offices, warehouses and any other facilities where you need to restrict access. Consider the types of intercoms according to their characteristics.

The main characteristics by which intercoms differ are:

1. Number of subscribers.
2. Degree of security.
3. Transferred data (audio only, or both audio and video).
4. Interface (handset or built-in microphone).
5. Device and principle of operation.
6. Functional.
7. Appearance.
8. Equipment.
9. Lock device.

All models are divided into:

• Small subscribers. Are intended for communication of 1 subscriber with the visitor. They are used in private homes, at checkpoints, to enter the office.
• Multi-subscriber. Used on objects with big amount (apartment buildings, office centers, administrative buildings, and so on). There are models for a different number of subscribers - from several to several thousand.

By degree of security

The indoor unit is operated in a safe environment: it is installed in a room where it is warm, dry, and there is no one to damage it intentionally.

The outdoor unit may have different designs. This depends on the level of security.

Main characteristics:

1. Presence of a protective peak of the forward panel. It is necessary to cover the panel with buttons and speaker from precipitation and direct sunlight.
2. Operating temperature range. Cheap Chinese models can operate in the range from -20º to +30º. Better devices operate at temperatures from -50º to + 50º.
3. The presence of dust and moisture protection of electronics. In winter, due to the temperature difference (between cold outdoor air and warm indoor air), condensation occurs inside the outdoor unit and on the electric lock, so these elements must have an anti-corrosion and lacquered coating.
4. Use of electret microphones and speakers with a rubber or latex diffuser in the outdoor unit. Due to humidity and sudden temperature changes, paper diffusers quickly fail.
5. Vanilla resistance of the buttons and the entire front panel. Since the outdoor unit can be intentionally damaged, it must be made of a durable alloy, without protruding fragile elements.
6. The durability of the keyboard and electric lock. At the entrance to 40-50 apartments, the device generates 200 thousand cycles (opening-closing). The period of uninterrupted operation should be about 1 million cycles.

With or without video

One of the main indicators is the type of signal that the intercom transmits.

Expensive video intercoms can not only broadcast video from an external unit to an internal one. They have the functions of video recording and signal transmission to other devices (smartphone, TV, tablet).

This functionality allows you to see and communicate with the visitor, even if the user is not at home.

Handset or speaker

In the room, the user can talk to the visitor through the handset or through the loudspeaker. Models with a loudspeaker are cheaper than with a handset, but they have a higher noise level. The visitor will hear not only the voice of the owner of the apartment, but also extraneous sounds.

Models with a tube are slightly more expensive, but provide a clear sound without extraneous noise.

According to the device and principle of operation

According to the addressing method, intercoms are divided into:

1. Coordinate (coordinate-matrix). To connect, you need as many wires as there will be subscriber units. For example, if you need to connect 30 apartments, 30 separate wires are allowed from the outdoor unit. Such systems are cheaper than others, but they are more difficult to maintain. The principle of operation is the same as that of a mini-ATS.
2. Digital. For connection, 2 wires are used, from which there is a wiring to subscribers. They cost more than coordinate ones, are easy to install. Most apartment buildings such devices cost. The main disadvantage is a higher probability of malfunctions (loss of a call signal, difficulty opening doors, listening to conversations from other subscribers).
3. Wireless. They do not require laying a separate line - they are connected via an existing telephone cable, via wi-fi or an Ethernet cable. The most expensive category includes a small number of models, mainly in the premium segment.

By functionality

Intercoms of different models may have the following additional functions:

• acoustic signal of button pressing (call and/or all buttons);
• the ability to open doors with a digital code or key;
• the ability to set individual codes.

Video intercoms of an expensive segment can have the following functionality:

• recording a photo, audio or video, which is launched by pressing the call button or by triggering a motion sensor;
• the ability to talk with a visitor from a smartphone / tablet when the owner is away from home;
• the ability to open doors from a smartphone.

By appearance

Traditional intercom device - flat metal panel buttons with a speaker and microphone outside, and a plastic block with a handset and a button to open the door in the apartment. Different models differ slightly in appearance.

There is more variety in video intercoms of the premium segment. outdoor unit looks the same, only supplemented by the "eye" of the video camera, motion sensor and backlight.

There can be several cameras: 1 - standard, on the intercom panel, and additional ones - at other points (for example, above the door, with a wide viewing angle to see not only the visitor's face, but also the space around him).

The internal blocks of such models are also made of plastic, but they have a large (several inches) display. The display can be color or black and white, touch or not.

By configuration

In stores you can buy intercoms in different configurations:

• separately calling panels, tubes, monitors;
• sets of audio intercoms (outdoor panel + handset);
• sets of video intercoms (door panel with camera + monitor with or without handset);
• additional equipment (cameras, video eyes) - separately or in a set with other devices.

According to the lock

The locks on the entrance doors are:

• Electromechanical. Cheaper than electromagnetic, can work with electricity off. The disadvantage is that they work worse in cold weather.
• Electromagnetic. More expensive than electromechanical, work smoothly in any weather. They operate only from the power supply (if the electricity fails, the lock cannot be opened or closed). Such locks are often placed in rooms that require enhanced control.

About manufacturers

There are products of about a dozen manufacturers on sale on the Russian market.

Main brands:

1. Visit (Visit). Mid- and low-price segment, assortment - audio and video intercoms, single-subscriber and multi-subscriber. The cost of a simple audio kit for 1 apartment is from 4000-5000 rubles.
2. Digital (Cyfral). The same features as the intercoms Visit.
3. Metacom. In addition to audio and video intercoms, it produces non-contact intercoms. The cheapest single subscriber set - from 2700 rubles.
4. Kommax (Commax). Old company, started in 1968 in South Korea. Products are sold in over 100 countries around the world. The range - about 100 models.
5. one touch. A line of expensive video intercoms operating over the Internet. Can be controlled from a tablet or smartphone.
6. Falcon Eye. A line of several dozen video intercoms, most models have an indoor unit in the form of a monitor, without a tube. Color touch display.
7. Slinex. The line of expensive premium video intercoms includes about 10 models.
8. Tantos. Several lines of simple budget audio and video intercoms.
9. Kocom. It produces audio and video intercoms of different price segments.

The most common in the Russian Federation are Tsifral and Visit intercoms - they are installed on "ordinary" apartment buildings and in inexpensive office buildings.

How to choose the right intercom?

Selection rules:

1. Determine the number of subscribers (individual apartments).
2. Determine the number of indoor units (you can put several units in the room that control one door).
3. Determine the method of identification (opening the door only by a call from the outdoor unit, or opening with a key, card or entering a code from the panel is possible).
4. Determine the number of intercoms from the entrance to the building to the final room. For example, in office centers 1 multi-subscriber intercom can be mounted at the entrance to the building, and 1 more can be mounted at the entrance to the floor or department.
5. Determine the method of fastening the outer panel: on a stand, built-in (mortise), invoice. The safest - built-in.
6. Determine whether an emergency door opening function is needed (for example, in the event of a power outage, if the lock is electromagnetic).
7. Select intercom functionality (with video or audio only, with the ability to record, with a motion sensor, with the function of communicating and / or controlling the door via a smartphone).

If you plan to deal with the choice of intercom on your own, it is better to seek advice from the company that installs them. There are more than fifty models on the Russian market, with different characteristics and functionality.

Intercom ( this most often means intercom system)- an electronic system consisting of devices that transmit a signal from the calling unit to the intercom.

Intercom system is a type of access control system. It is subdivided into single-subscriber and multi-subscriber devices. It can be equipped with automatic locking devices (AZU) of both electromechanical and electronic types. By the method of communication transmission: wired or by radio signal. The most complex equipment intercoms serve to ensure the safety of residents and the safety of their property and are installed on the entrances of apartment buildings. Modern multi-apartment intercoms are equipped with the following devices and functions:

1. Audio and video communication of the call block at the entrance to the intercom in the apartment.
2. Connecting the AZU to front door.
3. Installation of security systems and fire alarm with output to the control panel of the Ministry of Internal Affairs or the Ministry of Emergency Situations.
4. Emergency call from intercom service 112.
5. Providing communication with the calling panel of services 112, the Ministry of Emergency Situations, the Ministry of Internal Affairs, Ambulance, Dispatch, etc.
6. Voice informing from the services of the Ministry of Emergency Situations and the UK Housing and Communal Services both through the calling panel and through intercoms.
7. Monitoring with a face recognition system through a video surveillance system in the call block.

Intercom systems are constantly being improved for specific tasks and requirements of the customer, and today they are a multifunctional microprocessor system with block addition of one or another function. For 2015, there are no legislative acts or decisions according to which the intercom can be attributed to PZU systems (intercom systems) or intercom systems. Certification for the installation of these systems is not required. Also, there is still no single concept in the correct name: intercom, intercom system, ROM, etc.

The main types of intercoms

Intercoms are divided into low-subscriber (small-subscriber intercoms are installed, as a rule, in front of the entrance gates to private houses) and multi-subscriber (multi-subscriber intercoms are most often installed at the entrances of multi-storey and apartment buildings).

Multi-user intercoms are divided according to the principle of addressing into coordinate-matrix and digital. The most widespread are coordinate-matrix intercoms.

Intercoms are also divided into video intercoms and audio intercoms. Video intercoms, in addition to voice data transmission, are equipped with a video camera and transmit video of the caller (with the help of such intercoms, you can see the face of a person and determine if he is being forced to act forcibly).

The main components of intercoms

• Closer - The closer itself is not integral part intercoms, but often, is an integral part of the intercom system. The closer is attached to the wall and the door, automatically closes the door after someone enters or exits the entrance.

The main ways to open the door through the intercom (not vandal)

• Key. The lock is opened by a key that is brought to the reader.
• From the apartment. The door is opened using a special button on the subscriber device of the user after calling the apartment.
• Code. The lock is opened by dialing the code on the entry panel of the intercom. Due to the fact that any code sooner or later becomes the property of "unwanted guests", this function contradicts the purpose of installing an intercom as a means of restricting access, and can be disabled or the code can constantly change. Codes are divided into:
  1. General access- all residents of the entrance use the same code.
  2. Apartment-by-apartment- each tenant dials the number of their apartment, then presses the "Key" button, and then enters the code corresponding to the apartment number. Optionally, in the apartment, when the code is triggered, a warning signal can be given that someone below entered the entrance using the code of this apartment (an image of the incoming person can be additionally transmitted in the video intercom).
  3. Service- issued to employees of public utilities, as well as law enforcement agencies for free entry to the entrance or several entrances. In a system with apartment codes, the number of a non-existent apartment, for example, 000 or 999, can be used as a service number.

Intercom repair and maintenance business

"Intercom business" - the activities of companies in Russia and the CIS countries that install intercoms and reinforced doors at the entrance to the entrance, as well as servicing intercoms - often causes criticism from some residents. In particular, opinions are expressed about the inadmissibility of raising money for the installation of an intercom without holding a general meeting and approving the decision by a majority of votes, instead of which residents are often put "before the fact", justifying this by difficulties in obtaining the consent of the majority of residents.

Complaints and doubts about the legality of the actions of intercom installers also arise in cases where one of the residents of the house campaigns for the installation of an intercom (sometimes with signs of fraud), who concludes an agreement with the company on behalf of the residents, without a power of attorney on their behalf for the right to conclude such contracts. Tenants who did not give consent to the installation and defend their right to refuse the services they did not order are against coercion to pay for the installation and maintenance of the intercom.

Also, misunderstanding causes the need for an additional monthly payment for the maintenance of the device, which the residents purchased and installed at their own expense. There is no such need, however, a number of residents find the proposed intercom subscription service convenient, since it is designed to guarantee prompt troubleshooting and maintenance of the device and eliminates the need to pay for each call to the master.

Criticism of the actions of companies that install intercoms is also based on the assumption that the monthly subscription fee they charge from residents under the “maintenance agreement” is disproportionate to the volume of services provided for servicing the device. So, the volume of the annual fee for the maintenance of an intercom in Russia from one apartment is about 300-700 rubles, which, when calculated for a 100-apartment building, brings the company about 50 thousand rubles in annual revenue. At the same time, one should not forget that companies servicing intercoms maintain a staff of repairmen and repair (or replace) non-repairable intercom equipment at their own expense in case of vandalism or planned replacement. It is argued that the intercom service business is on the verge of a healthy profit margin of 10-15%.

A common case is the inclusion of a fee for the maintenance of intercoms in payment documents for payment of housing and communal services. This is done on a reimbursable basis by settlement centers, which are given the appropriate instruction either by the managing organization (or HOA) that has entered into a service agreement with the intercom organization, or directly by the intercom organization that has entered into a service agreement with residents. At the same time, very often there are simply no legal grounds for receiving payments from tenants ( . ).

An important point when installing an intercom is that the equipment being installed (except for intra-apartment subscriber devices, which almost always become the property of residents) belongs to residents or the intercom installer, which is determined by the terms of the installation contract being concluded. Equipment owned by the service organization, the latter has the right to dismantle upon termination of service.

It is illegal to deprive a tenant of the possibility of access to the entrance and the apartment, if the tenant did not want to pay for the installation of an intercom and does not want to use the handset. As a rule, these situations are solved by issuing keys or access codes to such residents free of charge. Experienced companies that install intercoms include the cost of keys for tenants who refuse to install in the total estimate. However, if there are a lot of tenants who refuse to pay, this can lead to the termination of intercom service and the possible dismantling of equipment owned by the intercom organization.

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Notes

An excerpt characterizing the Intercom

“Seven o’clock, I think.
- At 7:00. Very sad! Very sad!
The emperor said that he was grateful and bowed. Prince Andrei went out and was immediately surrounded on all sides by courtiers. Tender eyes looked at him from all sides and heard sweet words. Yesterday's adjutant wing reproached him for not stopping at the palace, and offered him his house. The Minister of War approached him, congratulating him on the Order of Maria Theresa of the 3rd degree, which the Emperor had bestowed on him. The chamberlain of the empress invited him to her majesty. The Archduchess also wanted to see him. He did not know whom to answer, and for a few seconds he collected his thoughts. The Russian envoy took him by the shoulder, led him to the window and began to talk to him.
Contrary to the words of Bilibin, the news brought by him was received joyfully. A thanksgiving service was scheduled. Kutuzov was awarded the Grand Cross by Maria Theresa and the entire army received decorations. Bolkonsky received invitations from all sides and had to make visits to the main dignitaries of Austria all morning. Having finished his visits at five o'clock in the evening, mentally composing a letter to his father about the battle and about his trip to Brunn, Prince Andrei returned home to Bilibin. At the porch of the house occupied by Bilibin, there was a britzka half-stowed with things, and Franz, Bilibin's servant, dragging the suitcase with difficulty, went out the door.
Before going to Bilibin, Prince Andrei went to a bookstore to stock up on books for the campaign and sat up in the shop.
- What's happened? Bolkonsky asked.
- Ah, Erlaucht? said Franz, heaving the suitcase into the britzka with difficulty. – Wir ziehen noch weiter. Der Bosewicht ist schon wieder hinter uns her! [Ah, Your Excellency! We're going even further. The villain is on our heels again.]
- What's happened? What? asked Prince Andrew.
Bilibin went out to meet Bolkonsky. There was excitement on Bilibin's always calm face.
- Non, non, avouez que c "est charmant," he said, "cette histoire du pont de Thabor (bridge in Vienna). Ils l" ont passe sans coup ferir. [No, no, admit that this is a charm, this story with the Taborsky bridge. They crossed it without resistance.]
Prince Andrew did not understand anything.
“But where are you from that you don’t know what all the coachmen in the city already know?”
“I'm from the Archduchess. I didn't hear anything there.
“And didn’t you see that they were stacked everywhere?”
- I didn’t see ... But what’s the matter? Prince Andrew asked impatiently.
- What's the matter? The fact is that the French have crossed the bridge that is defended by Auesperg, and the bridge has not been blown up, so that Murat is now running along the road to Brunn, and today they will be here tomorrow.
- Like here? Why didn't they blow up the bridge when it was mined?
- And I'm asking you. Nobody, not even Bonaparte himself, knows this.
Bolkonsky shrugged.
“But if the bridge is crossed, then the army is dead: it will be cut off,” he said.
"That's the point," answered Bilibin. - Listen. The French are entering Vienna, as I told you. Everything is very good. The next day, that is, yesterday, gentlemen marshals: Murat Lannes and Belliard, sit on horseback and set off for the bridge. (Note that all three are Gascons.) Gentlemen, one says, you know that the Taborsky bridge is mined and contramined, and that in front of him is a formidable tete de pont and fifteen thousand troops who were ordered to blow up the bridge and not let us in. But our sovereign Emperor Napoleon will be pleased if we take this bridge. Let's go three of us and take this bridge. - Let's go, others say; and they set off and take the bridge, cross it, and now, with the whole army on this side of the Danube, they are heading for us, for you, and for your messages.
“It’s enough to joke,” Prince Andrei said sadly and seriously.
This news was sad and at the same time pleasant to Prince Andrei.
As soon as he learned that the Russian army was in such a hopeless situation, it occurred to him that it was precisely for him that he was destined to lead the Russian army out of this situation, that here it was, that Toulon, which would lead him out of the ranks of unknown officers and open the first path for him. to glory! Listening to Bilibin, he was already thinking how, having arrived at the army, he would present an opinion at the military council that alone would save the army, and how he alone would be entrusted with the execution of this plan.
“Stop joking,” he said.
“I’m not kidding,” Bilibin continued, “there is nothing fairer and sadder. These gentlemen come to the bridge alone and raise their white handkerchiefs; they assure us that there is a truce, and that they, the marshals, are going to negotiate with Prince Auersperg. The duty officer lets them into the tete de pont. [bridge fortification.] They tell him a thousand Gascon nonsense: they say that the war is over, that the Emperor Franz has appointed a meeting with Bonaparte, that they want to see Prince Auersperg, and a thousand Gasconades, and so on. The officer sends for Auersperg; these gentlemen embrace the officers, joke, sit on the guns, and meanwhile the French battalion enters the bridge unnoticed, dumps bags of combustible substances into the water and approaches the tete de pont. Finally, the Lieutenant General himself, our dear Prince Auersperg von Mautern, appears. "Dear enemy! The color of the Austrian army, the hero of the Turkish wars! The enmity is over, we can give each other a hand ... Emperor Napoleon burns with the desire to know Prince Auersperg. In a word, these gentlemen, not for nothing, the Gascons, so bombard Auersperg with beautiful words, he is so seduced by his so quickly established intimacy with the French marshals, so blinded by the sight of Murat's mantle and ostrich feathers, qu "il n" y voit que du feu, et oubl celui qu "il devait faire faire sur l" ennemi. [That he sees only their fire and forgets about his own, about the one that he was obliged to open against the enemy.] (Despite the liveliness of his speech, Bilibin did not forget to stop after this mot to give him time to evaluate it.) The French battalion runs into tete de pont, the cannons are hammered in, and the bridge is taken. No, but what’s best,” he continued, calming down in his excitement at the charm of his own story, “is that the sergeant assigned to that cannon, at the signal of which it was supposed to light the mines and blow up the bridge, this sergeant, seeing that the French troops they were running to the bridge, they were about to shoot, but Lann took his hand away. The sergeant, who apparently was smarter than his general, approaches Auersperg and says: “Prince, you are being deceived, here are the French!” Murat sees that the case is lost if the sergeant is allowed to speak. He turns to Auersperg with surprise (a real Gascon): “I don’t recognize the Austrian discipline so praised in the world,” he says, “and you allow the lowest rank to speak to you like that!” C "est genial. Le prince d" Auersperg se pique d "honneur et fait mettre le sergent aux arrets. Non, mais avouez que c" est charmant toute cette histoire du pont de Thabor. Ce n "est ni betise, ni lachete ... [This is brilliant. Prince Auersperg is offended and orders the arrest of the sergeant. No, admit it, it's lovely, this whole story with the bridge. It’s not that stupid, it’s not that mean…]
- With "est trahison peut etre, [Perhaps treason] - said Prince Andrei, vividly imagining gray overcoats, wounds, gunpowder smoke, the sounds of firing and the glory that awaits him.
– Nonplus. Cela met la cour dans de trop mauvais draps,” continued Bilibin. - Ce n "est ni trahison, ni lachete, ni betise; c" est comme a Ulm ... - He seemed to be thinking, looking for the expression: - c "est ... c" est du Mack. Nous sommes mackes, [Also no. This puts the court in the most ridiculous position; it is neither treason, nor meanness, nor stupidity; it's like at Ulm, it's... it's Makovshchina. We got dunked. ] he concluded, feeling that he had said un mot, and fresh mot, such a mot that would be repeated.
The folds on his forehead that had been gathered up to that time quickly unfolded in a sign of pleasure, and he, smiling slightly, began to examine his nails.
- Where are you going? - he said suddenly, turning to Prince Andrei, who got up and went to his room.
- I'm going.
- Where?
- To Army.
“Did you want to stay two more days?”
- And now I'm going now.
And Prince Andrei, having made an order to leave, went to his room.
“You know what, my dear,” Bilibin said, going into his room. “I thought about you. Why are you going?
And to prove the irrefutability of this argument, the folds all fled from the face.
Prince Andrei looked inquiringly at his interlocutor and did not answer.
- Why are you going? I know you think it's your duty to jump into the army now that the army is in danger. I understand this, mon cher, c "est de l" heroisme. [my dear, this is heroism.]
“Not at all,” said Prince Andrei.
- But you are un philoSophiee, [philosopher,] be it completely, look at things from the other side, and you will see that your duty, on the contrary, is to take care of yourself. Leave it to others who are no longer good for anything ... You were not ordered to come back, and from here you were not released; therefore, you can stay and go with us wherever our unfortunate fate leads us. They say they are going to Olmutz. And Olmutz is a very nice city. And you and I will calmly ride together in my stroller.
“Stop joking, Bilibin,” said Bolkonsky.
“I tell you sincerely and in a friendly way. Judge. Where and for what will you go now that you can stay here? One of two things awaits you (he collected the skin over his left temple): either you don’t reach the army and peace will be concluded, or defeat and shame with the entire Kutuzov army.
And Bilibin loosened his skin, feeling that his dilemma was irrefutable.
“I can’t judge this,” Prince Andrei said coldly, but thought: “I’m going to save the army.”
- Mon cher, vous etes un heros, [My dear, you are a hero,] - said Bilibin.

That same night, bowing to the Minister of War, Bolkonsky went to the army, not knowing where he would find her, and fearing to be intercepted by the French on the way to Krems.
In Brunn, the entire court population packed up, and heavy loads were already sent to Olmutz. Near Etzelsdorf, Prince Andrei rode onto the road along which the Russian army was moving with the greatest haste and in the greatest disorder. The road was so crowded with wagons that it was impossible to ride in a carriage. Taking a horse and a Cossack from the Cossack chief, Prince Andrey, hungry and tired, overtaking the carts, went to look for the commander-in-chief and his wagon. The most ominous rumors about the state of the army reached him along the way, and the sight of the army running in disorder confirmed these rumors.
"Cette armee russe que l" or de l "Angleterre a transportee, des extremites de l" univers, nous allons lui faire eprouver le meme sort (le sort de l "armee d" Ulm)", ["This Russian army, which English gold has been brought here from the end of the world, will experience the same fate (the fate of the Ulm army). ”] He recalled the words of Bonaparte’s order to his army before the start of the campaign, and these words equally aroused in him surprise at the hero of genius, a feeling of offended pride and the hope of glory. "And if there is nothing left but to die? he thought. Well, if necessary! I will do it no worse than others."
Prince Andrei looked with disdain at these endless, interfering teams, carts, parks, artillery, and again carts, carts and carts of all possible types, overtaking one another and blocking the muddy road in three, four rows. From all sides, behind and in front, as long as hearing was enough, the sounds of wheels, the rumble of bodies, carts and gun carriages, the clatter of horses, blows with a whip, shouts of prodding, curses of soldiers, batmen and officers were heard. Along the edges of the road, one could see incessantly fallen horses, skinned and not skinned, now broken carts, in which, waiting for something, lone soldiers were sitting, then soldiers separated from the teams, who were heading in crowds to neighboring villages or dragging chickens, rams, hay or hay from the villages. bags filled with something.

The types of intercoms on the market can radically differ from each other in terms of the principle of operation. However, the main function and purpose remain the same - it is these intercom and locking devices that allow you to open the door, knowing who is behind it.

Types of intercoms - what are they, how do they work

In many houses, the owners of the living space prefer to replace the bells and door peepholes with intercoms. Having bought an intercom, you can open the front door for a guest or a member of your family remotely by pressing one button located inside your house.

Depending on the number of users, intercoms are also divided into multi-user (they are used in multi-apartment, most often new buildings) and single-user (they are installed in offices, warehouses, suburban private houses and cottages). Those that are multi-subscriber are divided into coordinate-matrix (used most often) and digital.

Choosing among the many similar devices, decide first what type of device you need - there are audio intercoms and video intercoms. To understand the basic principle of operation of both, imagine that when you press a button on a special calling panel near the front door, an audio or video signal is transmitted to the panel already inside the room. Further, the order of work already depends on the type of intercom.

If you stop at the audio option, then you can only hear those who came to visit you. This device is often in demand in apartment buildings - the cost of the system itself and installation is relatively low, as well as the cost of maintenance. However, a significant disadvantage of the system is the absence of any control on the scale of an apartment building. You don't know how many people have passed through the door, you don't see the people coming in, and you don't know who got out. What does it cost for an incoming call to any apartment to introduce himself as a postman or an elevator operator? So it would be wrong to talk about the complete safety of the residents of the house and their property in this case, everything still depends on their consciousness and caution.

Video intercom - pros and cons

Unlike the audio version of the intercom, the video version allows you not only to hear, but also to see who enters your house. An unwanted guest (perhaps a thief) can still get inside the building if the light is turned off - then the system does not work. The advantages of video intercoms include the ability to install cameras from different angles at the same time - for this, additional video recording devices are connected, which transmit the image. Recording an image and storing data on a hard drive can significantly increase the level of security or, in extreme cases, quickly identify a person who has committed illegal acts in the house.

If the audio intercom, being a simpler intercom, consists of an external call panel, a switch and a subscriber handset, then the video analogue of the device, in addition to the microphone and speaker in the call panel, also has a built-in video camera. The small video device is usually equipped with an infrared light to distinguish people knocking at the door in the dark. Inside the house, such an intercom has a monitor - today both black and white options and color options are available, of various sizes.

Intercom selection - control system

Both types of devices - both video and audio options, are equipped with an electric lock system. Opportunity remote control locks and is the main advantage of the devices. By pressing the button on the inner panel, you open the front door in front of a visitor who has dialed your apartment number on entrance panel. Such electric locks are presented by manufacturers in two versions - electromagnetic and electromechanical. The first type is more common, the second has a more complex mechanism and is more expensive.

The electromechanical lock is an improved version of the conventional door device, which, with the help of a bolt, blocks the access of visitors to the premises. In normal operation, when there is voltage in the network, the lock opens automatically due to a short-term impulse of electricity or the operation of a low-power electric motor. If the house is disconnected from the light, the front door will not remain unprotected, as is the case with electromagnetic locks.

In this case, the device works like a normal door deadbolt, which can be opened either from the inside, by pressing a button, or from the outside, using a special key.

Be prepared for the fact that the audio or video communication system may fail completely, which means that strangers can enter either thanks to the residents of the house who have a magnetic key, or with the help of mobile phone, by which you can inform the owner that you have come to visit him.

Which intercom to choose - the degree of security

Before choosing an intercom, decide whether you want a video device, or for your safety it is enough to own an audio option. True, in the case of an apartment building, the choice is almost a foregone conclusion in the direction of a cheaper audio device that everyone can afford. Then insist on buying a branded model of a well-known company. Chinese version, cheaper - like a lottery. You may be lucky and the intercom will work properly for a long time, or vice versa, break down several times a month. An expensive intercom is usually offered separately from the call panel. In the Chinese version, everything comes in one set. It is most convenient to buy an intercom from a well-known company and immediately negotiate with representatives of the manufacturer or distributor about the installation. Then, if something is wrong with the device, the issue with the malfunction of the device will be resolved on the spot by the company itself.

In this case, the device is either replaced (and at no extra charge), or repaired under warranty. If you take care of the installation yourself, then you also take responsibility. But whether you will be able to return the Chinese version of non-working products even under warranty is not yet clear. It is better to discuss the issue of maintenance and clear terms of the warranty period immediately. As practice shows, high-quality intercoms of well-known brands work without repair for several years.

Immediately specify when buying how many channels the intercom has and how to connect them. If you buy a video intercom, pay attention to whether it has a black and white or color screen. If it is constantly dark in front of the door, then in both cases you will see a black and white picture. If you want to see color image, you will need to install additional lighting fixtures.

You may also have a choice - a video intercom with a handset or with a built-in loudspeaker. Without a tube, the noise level is much higher, and sometimes you may encounter an unpleasant whistle that occurs due to high humidity, precipitation and temperature changes. In the variant with a tube, such problems usually do not arise. As additional function The video intercom may have a built-in memory. The service is not cheap, but it will allow you to take pictures of people coming to you, and an additional convenience is that the device can do this around the clock, even in your absence.

Recently, video intercoms have become extremely popular. They are used not only for private houses and individual apartments, but also in apartment buildings, to increase the security of offices, warehouses, etc.

Their use provides the user with a number of significant advantages:

• the ability to communicate and identify the visitor, while limiting direct communication and the danger of physical impact;
• the use of infrared light sources makes it possible to see the visitor in complete darkness;
• front door control directly from the apartment;
• the possibility of video recording or photo fixation of visitors who ring the doorbell in the absence of the owners.

Manufacturers offer a large selection of various models of different design functionality and cost. Video intercom can be equipped with additional video panels, tubes, locks, video cameras.

Most devices adapted to work in harsh domestic conditions are unpretentious and do not need frequent maintenance have a fairly long service life.

The use of electromechanical or electromagnetic locks securely blocks the door from unauthorized entry. They are opened from the inside by pressing one button, and from the outside with the Touch Memory key or by dialing a code.

DEVICE AND COMPOSITION OF EQUIPMENT

Most models of modern video intercoms consist of the following elements:

Call panel.

The device, which includes:

• camcorder;
• infrared light source;
• microphone;
• keypad for calling a subscriber;
• signal receiver for reading the touch memory electronic key.

The device, as a rule, is made in an anti-vandal version, has a durable metal case covered with non-flammable paint resistant to mechanical stress. The camera lens is either located deep in the case (pin-hole type) or covered with thick armored glass. In both cases, the viewing angle of the video camera is quite limited, so many models are made with the ability to connect additional cameras.

Internal module.

It is a subscriber control unit. It usually consists of a display, a keypad for controlling the electronic lock and device functions, a speaker for ringing, and a handset. The power supply can be placed inside the device or be external (network adapter).

Lock.

Most often, video intercom sets use an electromechanical or electromagnetic lock. Both of them are controlled from the subscriber panel, they open from the inside by pressing a key. From the outside, the electromechanical one is opened with an ordinary key, and the electromagnetic key is Touch Memory, an electromagnetic card or a code dialed on the call panel.

The use of electromechanical locks is preferable, since in the event of a power failure, they remain closed, while electromagnetic ones unlock the door.

Pairing block.

This device is used in multi-subscriber video intercoms, allows you to connect an individual subscriber panel to a common video intercom system. Its choice should be approached very responsibly, as many manufacturers produce models of video intercoms that do not support this device.

There are two types of interface units - for analog and digital video intercoms. Based on the experience of intercom system installers, the most common digital video intercoms that support an interface unit include:

• Raikmann (models CD 1803, 1903, 2000, 2250, 3000);
• Rainmann (CD2000, Lascomex AO3000);
• Filman, Proel, Keyman, Marshal (model CD700, 2255).

Coordinate matrix video intercoms supporting interface blocks include:

• Eltis (300, 303, 400, 420 series models);
• Cifral (Intel and CCD2094);
• Vizit (models of series 100, 200, 400);
• Marshal (Models CD 3099, 3159, 3255).

Interface units are not compatible with the models of the Italian manufacturers Farfisa and Urmel, presented on the Russian market.

For the end user, there are no significant operational advantages that digital or analog video intercoms provide. The main difference lies in the peculiarities of addressing apartments and, as a result, a different number of cables to be laid.

In coordinate matrix intercoms, a pair of males is laid from each apartment, one of which is responsible for units, the second for tens. Therefore, to connect the subscriber panel of the video intercom, it is necessary to use an interface unit with galvanic isolation. In digital interface units, setting the apartment number is carried out by switching jumpers (contact jumpers).

Depending on the design features, the following classification of video intercoms is carried out:

By subscriber panel type:

• black and white or color;
• with a call tube or hands-free;
• with keypad or touch;

Connection method:

• multi-subscriber or single subscriber;
• wired or wireless;
• coordinate matrix (analog) or digital.

In most cases, classification by external features is important for users, but the division into analog and digital devices is more important, on which the functionality and compatibility of the entire system depends.

ANALOGUE VIDEO DOORPHONES

Coordinate matrix intercom systems, as a rule, are designed for operation in apartment buildings. Their main disadvantage is the high complexity, both in installation and maintenance. In addition, these systems are static, extremely difficult to upgrade, and scalable when purchased.

The main design features of analog video intercoms:

1. A centralized power supply unit with an integrated 12-24 V transformer to which all executive devices in the entrance are connected.
2. The coordinate call system of the subscriber is implemented on the basis of access switches.
3. As a rule, the main information highways are multi-core cables, as well as the lines going to the subscribers' apartments, they are protected from accidental mechanical damage and incorrect switching.

Features of calling a subscriber in an analog video intercom system.

Coordinate matrix system at the moment, it is most common among multi-subscriber video intercoms. In such a system, each subscriber device is connected separately.

A multi-core cable runs from the switch through the entire entrance along the riser, the wires of which are distributed into tens (from 0 to 7 for the COM 80 model) and into units (from 1 to 10). Thus, up to 80 subscriber devices can be connected from one switch.

Connection of a subscriber device is carried out by connecting two wires to the corresponding pair of a multi-core cable. In this case, the tens wires are connected to the plus terminal, and the unit wires to the minus terminal. Reverse polarity may result in a general malfunction of the equipment.

For small houses for 10-20 apartments will do coordinate intercom with built-in switch. Connecting such a device will not cause any complications, since from the call panel, which is also the controller of the entire system, cables are laid to each subscriber device from the corresponding call button. Such intercoms are somewhat cheaper, and installation and further operation are much easier.

DIGITAL VIDEO DOORPHONES

Digital video intercoms are gradually replacing analog ones, surpassing them in almost all respects. Among the main advantages are the following:

Ease of installation.

For digital video intercoms, switches and multi-core loops are not needed, the transmission of audio and video information, as well as information and command signals to the door control device, can be carried out via a conventional twisted pair cable. Moreover, only 4 wires per 1 subscriber device will be involved in it.

No costly and complex maintenance.

Despite quite high efficiency systems based on microcontrollers and microcircuits are quite simple and have a limited number of standard emergencies. In addition, many models have a self-diagnostic function that periodically polls all devices and issues a coded error message. The standard repair is to replace a failed unit or reinstall the firmware.

System stability.

Unlike analog intercom systems, failure of one or more subscriber devices cannot affect the performance of the central controller. While changing the polarity of the connection in one subscriber tube can put the entire coordinate matrix intercom system.

It should also be noted a rich selection of models, both in terms of functionality and external design. This is especially true for systems for individual use and subscriber panels.

However, digital intercoms also have certain disadvantages:

• the cost of digital devices is still quite high;
• many devices from different manufacturers are not compatible.

The principle of operation of a digital video intercom.

If digital video intercom equipment is still quite expensive, then its connection is much simpler and cheaper. It is based on a 4-core cable, to which subscriber devices are connected in parallel with polarity. Most multi-subscriber models can serve up to 255 subscribers, which is more than enough for an average entrance.

The signal coming from the call panel is identified as follows:

On the internal board of the subscriber video panel there are contact jumpers - jumpers. To encode the receiving device, you need to close the jumpers in such a way that in total they give the apartment number.

When dialing the corresponding number on the calling device, a signal is generated for the entire line. Only the receiving device where the necessary combination is closed will work.

The main disadvantage of this method is that when replacing the receiving device, it must be configured from scratch, unlike analog devices that start working immediately after connecting the wires.

CRITERIAS OF CHOICE

When choosing specific model video intercom, you need to pay attention to the following parameters:

The call panel must be made of durable material, communication devices (microphone and camera) are reliably protected from external influences. According to international standards, the protection class must be at least IP66. Preference is given to panels without mechanical switches.

Touch devices are more reliable; during their operation, there are no cases of sticking buttons, oxidation of contacts, etc. however, such panels are less resistant to vandalism.

When choosing a camera for a video intercom, you should take into account the level of illumination of the entrance. If the tenants cannot provide a constant source of light, there is no point in purchasing a color camera. On the contrary, the use of black and white is preferable, since it has more high level resolution, high light sensitivity, and under IR illumination, any color camera will still go into black and white.

The choice of monitor parameters also needs to be compared with the maximum quality of the image transmitted by the camera. It is not advisable to purchase a monitor with high resolution if the camera outputs only the PAL standard (380-420 TVL), which corresponds to 0.5 Mpx.

Touch Memory electronic keys are widely used to open the front door, however, many models can be opened contactless using special magnetic cards, which is more convenient. It is preferable to choose a model where the lock can be unlocked additionally by entering a code on the keypad of the call panel.

In most modern models, it is possible to output the video signal from the subscriber panel to the TV screen or PC monitor.

As an additional option, it is possible to provide for the connection of an additional motion detector, which will activate the camera to record visitors, this feature will significantly increase the security of the video intercom system.

An extremely important parameter is the operating temperature range of the call panel and the switch, which, as a rule, are located in an unheated technical room at the entrance. There is a clear advantage here domestic models, which are initially designed for harsh operating conditions.

If you have to connect to a multi-subscriber intercom system, pay attention to the compatibility of the interface module and the existing, installed equipment, as well as to the coordinate matrix models of subscriber devices.

If you want to install a video intercom in individually in an apartment, in a country house or in a private house, it is more expedient to choose digital models with wide functionality that can be easily installed and maintained independently.

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© 2014-2020 All rights reserved.
The site materials are for informational purposes only and cannot be used as guidelines and normative documents.

An intercom is an electric intercom and locking device that provides security and control of public order at residential or industrial facilities.

The purpose of the devices is to contain third-party access to offices, banks, cottages, apartments, shops and other facilities or institutions. Such devices are technically complex and have extensive functionality, as well as modern design and high anti-vandal level.

Definition and types

The simplest and most reliable intercom audio model, but already outdated, because. color touch panels are getting cheaper, and some have the ability to write incoming messages to a memory card

Intercoms and video intercoms are divided by the principle of addressing, by the method of identifying / determining visitors and by the number of subscribers served.

Brands of intercoms by the number of subscribers served

1. Small subscriber - more often mounted in front of private facilities. The purpose of such devices is to serve an individual / one subscriber (at the entrance to houses, cottages, enterprises, at security posts, etc.).
2. Multi-subscriber - found at the entrances of apartment (high-rise) buildings, administrative buildings, etc. Previously, such systems were used for a narrower circle of customers (4-6). Now, multi-subscriber intercoms are being installed for several thousand customers and provide access to dozens of entrances.

Types of intercoms according to the way of addressing

1. Coordinate matrix - are connected depending on the number of subscriber units, that is, if there are 20 subscribers, then there should be the same number of wires. The operation of such systems, although low in terms of pricing, creates problems, since there are a lot of wires and the network can be overloaded.
2. Digital devices - are connected using two wires and have a high cost. But such devices break down more often and unintentional listening to conversations by neighbors is not ruled out, as well as not receiving a call signal or the inability to open the front door.
3. Wireless systems - connected via IP or an existing telephone line, that is, without additional communication lines. Elite intercoms of this type are connected to telephone wires or using an Internet cable / Wi-Fi. The system is based on an external housing (call panel with keys, camera or without) and internal (monitor or handset). Intercoms of this type are controlled either using a smartphone / tablet - for IP devices or via a handset. When connecting the handset - there is no possibility of video surveillance. This effect can be achieved in the case of complex installation with a monitor.

Types of intercoms according to the method of identifying visitors

1. Audio intercoms - serve for two-way audio communication between a subscriber and a visitor and provide the ability to identify by voice, roughly speaking two-way radio.
2. Video intercoms are used for video monitoring of the external / surrounding space and provide two-way audio communication between the subscriber and the visitor, which makes it possible to identify by the received image and voice. A feature of video intercoms are video eyes - built-in mini-cameras that carry out video surveillance of visitors. Most often, such a camera looks like an ordinary peephole. Pinhole lenses are considered the most popular.

The intercom with a pinhole camera has a high rating (among analogues), as it monitors the space from the side, in front of the door, and, if desired, the landing. Another feature of this lens is the maintenance of covert recording indoors.

The most elite intercoms have not only the ability to audio and video surveillance, but also have a touch panel, the ability to record and save events / data / identity of visitors (about sixteen). Some manufacturers have moved on and use control / identification using a phone or TV as an intercom / monitor. This is done manually or automatically: the signal is sent to the device (smartphone / TV) and the intercom function is turned on, and after the end of the conversation it switches to the standard operating mode. Wireless brands of intercoms have such characteristics.

The above criteria affect the cost and rating of devices. Standard audio intercoms, unlike video intercoms or more elite models, have a low cost.

Technical Components

Basically, intercoms have general design, but the difference is the absence / presence of a screen, memory, sensors and other components.

The following items are required for installation:

• case of the external unit (panel/call case, on which the display/panel with or without a screen is located, keys, an indicator-key reader or a touch monitor with a built-in microphone);
• housing of the subscriber (internal) unit, on which the control panel with or without a screen is located, a handset or monitor with a touch panel with a built-in microphone;
• processor node;
• control equipment;
• main and spare power supplies;
• wires/communication lines;
• remotely coordinated electric lock;
• door closer.

Control equipment, like the body, can be touch-sensitive, color or black and white. Power supplies also differ in terms of power, depending on the assigned functions.

Why you should pay attention to door closers and locks

An important point are the brands of locks and closers. The process of blocking and access with locks can be electromagnetic and electromechanical:

1. To remotely open the door, an electronic signal is needed, so the power consumed by the lock should not exceed 24 V. It is also necessary to immediately consider insulation. This is determined by the fact that intercoms are installed on a metal surface, and when exposed to a humid environment, this will cause injury and serious consequences.
2. An electromechanical lock costs a little less than an electromagnetic one and has the ability to work when the power is turned off (that is, it switches from electrical to mechanical principle of operation). But normal operation is possible only in mild/medium climatic conditions.
3. An electromagnetic lock is a section of an electromagnet on one side (on the door frame) and a steel plate on the other (on the door). Such a device costs quite a lot of money, therefore it is most often installed only in certain rooms that require closer attention than others. The design consists of magnets coupled with electricity, which takes into account:
   • containment by magnets not less than 300 kg;
   • suppression of magnetization when a signal is given and preservation in emergency circumstances;
   • light and sound alarm when opening the door;
   • control / adjustment of the opening time interval (from 1 to 15 s), etc.

As for the door closers, the elements serve to force the door to close and reduce the likelihood of third-party visitors passing through. Closers coordinate the closing speed, limit sudden opening / closing (that is, the mechanism is smooth), and sometimes fix the door in the open position. Moreover, each element has a maximum weight of the door, at which the door closer can be operated and it is not permissible to mount the component on a heavier structure than it can withstand. There are brands of closers for home and industrial / industrial use. The most common are elements for home use, which are currently available in many variations / varieties and are able to withstand harsh winters.

How to choose an intercom

The choice of an intercom depends on several factors: the price of the device with installation and the degree of security that the subscriber needs. Plus, the choice is influenced by the number of clients served (multi-subscriber or small-subscriber), which directly depends on the tasks to be solved by clients (audio and video identification) and their financial condition.

Key points when choosing:

1. First, it is desirable to decide on the future number of clients (subscribers) served - to ensure the safety of a certain apartment or an entire entrance, that is, low-subscriber or multi-subscriber. Here you need to pay attention to the following facts:
   • the installer company must have experience in this area;
   • the manufacturer must take into account climatic conditions (temperature differences from -45 to +45, moisture resistance);
   • the case must have a high level of anti-vandalism;
   • an intercom with recording, sensors or other technically complex details must be stable in cases of power fluctuations;
   • a certificate from the manufacturer/installer is required;
   • availability of documentation for operation and installation;
   • the possibility of buying certain or individual parts in the event of a breakdown (especially parts for touch-screen intercoms);
   • availability of after- and warranty service.
2. It will be determined with the required number of blocks (from one to several blocks can be installed in one apartment).
3. Identification type: password, electronic or optical key, card, etc. (Depending on the brand of the manufacturer, two types of identifiers can be selected).
4. The number of codes to be read.
5. Protection level. For example, two-level protection provides for mounting one block at the entrance to the object, and the second directly near the door. The first can be low-subscriber, and the second multi-subscriber. That is, if desired, you can install entire intercom systems.
6. The type of electric lock that is used in the intercom: electromechanical or electromagnetic.
7. When choosing a video intercom, you should pay attention to the viewing circle (possibly with a pinhole camera), the presence of backlighting during a dark period of time, as well as the types of adapters or current rectifiers.
8. Mounting method of the radio or video intercom: built-in / mortise, surface or on a stand with the possibility of rotation. The highest rating has a built-in (into the wall) device, as it has an anti-vandal level higher than that of analogues.
9. It should also be borne in mind that in the event of any emergency circumstances, the door should not be blocked, but opened easily (if a fire occurs, a power outage).
10. Door closers:
    • the maximum weight of the door that the part can withstand;
    • domestic or industrial use;
    • regulation of the system according to the season;
    • possibility of use in different climatic conditions and with temperature fluctuations.
11. Ease of device programming as well as reprogramming.
12. Intercom wireless or IP.
13. Models and brands of devices: color, touch, with or without camera / memory, intercom with or without recording, etc.

Depending on the above points, it is determined not only how much it costs separate model intercom, but also the period of operation.

Intercom service life

How long the intercom will last, as well as individual parts of the structure, according to established standards, have different indicators. But mainly the duration is distinguished - from 5 to 8 years of the whole structure in general.

Separately, it is worth noting the wear of the secret mechanism and the time between failures (or the cycle of use).

Overview of door entry panels for apartment buildings

The secret mechanism of the electric lock wears out after two or three months, and later you can open such a door with a paper clip or ordinary wire. Therefore, intercoms mounted in high-rise entrances are best selected with electronic keys and readers that are more durable. Which intercom is better in this regard? This is a device where “Touch memory” indicator keys are used.

MTBF or cycle of using the electric lock and keyboard on the block. This means that with a specific number of apartments in the house (for example, 50), a certain cyclical opening of the door is necessary, when a signal hits the electric lock or when pressing / entering keys on the case. In a year, with a number of 50 apartments, such a cycle is 200,000 (entry, admission of visitors). For the entire period of operation - about 1,000,000. Therefore, the appointment should be determined depending on the number of apartments: mechanical and electromechanical - no more than 30, and for entrances where the number of apartments is more than 30 - electromagnetic locks. Experts note that with such an operating time, the mechanisms are repaired after a maximum of three years.

Intercom manufacturers (what is on sale)

Elite intercoms or standard ones, which identify the visitor by voice, of course, differ from their counterparts. Important factors here are the manufacturer's rating, how much the system costs and what features it has.

To date, there are many companies that provide these products, but the following companies stand out: Visit, Digital, Comax, Quantum, Kennway, Kokom, which produce the following models: intercom with recording, black and white or color screen, etc. Distinctive features of manufacturers in principle not significant: the systems have a high anti-vandal level, they develop models of different configurations, but Comax, Quantum and Kenneway manufacture more elite models of devices.

The list of some companies for the manufacture of intercoms:

1. "Visit"

The company offers radio and video intercoms for affordable prices. The quality of such systems has already been tested by millions of consumers, which gives the right to assert good performance and durability of materials. Importantly, "Visit" has been providing services for 10 years. Blocks and mechanisms of systems operate in all weather conditions, with little to no failures. Audio intercoms have the highest rating, but the company also produces color intercoms with a recording function, with a pinhole camera, etc.

What is the price?

• multi-subscriber systems range from 3 130.00 rubles. up to 5 565.00 rubles;
• video monitors: from 2 020.00 rub. up to 7 560.00 rubles;
• single-subscriber on average: from 2 500.00 rubles. up to 5 910.00 rub.

Single station intercom with pinhole color camera and backlight function

Single station intercom with board color camera, with backlight function and 20 degree rotation.

Multi-subscriber intercom with a color camera board, with backlight and day-night function. Serves 40 subscribers. Button block mounted separately

Color monitor with handset for connection to a single or multi-site system

2. Digital

The company offers radio and video intercoms at affordable prices. "Cifral" has been providing services since 1998 and is characterized by the reliability and durability of materials. Blocks and mechanisms of systems operate in all weather conditions, with little to no failures. Intercom with or without screen, recordable or not, and different kinds contactless intercoms - produced by the company "Cifral".

Average cost of intercoms:

• multi-subscriber systems range from 2 430.00 rubles. up to 5 565.00 rubles;
• video monitors: from 1 746.00 rub. up to 4 442.00 rubles;
• single subscriber: from 1 680.00 rub. up to 3 140.00 rub.

Door block (call panel) for covert surveillance with a camera, with the possibility of remote access opening

Single-user intercom with camera supporting radio and video communication

Multi-subscriber mortise intercom that supports audio communication. Designed to serve 10 subscribers

Multi-subscriber mortise intercom, with support for radio-type communication. Designed to serve 200 subscribers

Video monitor-tube designed for coordinate matrix communication with a color screen

Color touchscreen video monitor for multi-site and single-site systems with built-in memory

Video monitor with black and white display

3. Metacom

The company offers radio and video intercoms of various configurations and prices. Metacom has been providing services since 1996 and is characterized by reliability and durability of materials. Blocks and mechanisms of systems operate in all weather conditions, with little to no failures. Intercom with or without recording, with the ability to view video or not, as well as contactless intercoms - produced by Metakom.

What is the price?

• multi-subscriber systems range from 4 048.00 rubles. up to 5 565.00 rubles;
• video monitors: from 1 900.00 rub. up to 5 442.00 rubles;
• single subscriber: from 2 680.00 rub. up to 4 140.00 rub.

Multi-subscriber mortise intercom, with support for radio-type communication. Designed to serve 999 subscribers

Multi-subscriber mortise intercom, with support for radio-type communication and having an individual call button for each subscriber. Designed to serve 20 subscribers

Single-subscriber intercom, with support for radio-type communication and having a built-in call button

Color monitor with touch screen, working in combination with Commax systems

Color video monitor, with the ability to view the situation in front of the camera

4. Commax

The company offers radio, IP and video intercoms of various configurations and prices. Commax has been on the market for over 40 years and provides systems for production, offices, homes and other facilities. Blocks and mechanisms of the systems operate in all weather conditions and with little to no failures. Intercom with or without memory, with or without video viewing, as well as contactless intercoms with the latest technology, various designs and complete sets, provides the firm "Kommax0". The cost of intercoms from the manufacturer is high, but it is characterized by strength, durability and various functionalities.

Call panel with built-in color camera (day-night) with backlight and medium viewing angle (47-34)

Call panel with built-in color camera (day-night) with backlight and viewing angle of 81-56 degrees

Call panel with built-in black and white camera with infrared illumination

Wireless intercom that connects to a telephone line

5. It is worth noting One Touch IP intercoms

These are devices that are developed on the principle of connecting to the Internet. These intercoms have a high resolution camera (3 megapixels), an easy way to control and manage via phone or tablet. The intercom with recording based on IP technology has wide, circular viewing angles and a high anti-vandal level.

There are many varieties of devices and which intercom is better to purchase depends on the available funds and intended purpose. Standard intercoms are defined by a simple interface, audio identification and low cost. Brands of such systems have a high level of anti-vandalism. The service life of the radio intercom is characterized by a long period - up to 8 years without repair. But elite intercoms are not inferior in these criteria. Such devices have a more complex technical design, the highest rating among analogues and come with black-and-white or color monitors and cameras, with different lens viewing angles, different memory sizes, etc. The main factors here are the installation principle (number of lines or based on the principle of wireless technologies), the possibility of maintenance after installation, replacement of mechanisms and elements of the case/monitor.